diff --git a/README.mkdn b/README.mkdn
index bfeb538..11cfbf8 100644
--- a/README.mkdn
+++ b/README.mkdn
@@ -18,6 +18,9 @@
 
     sudo apt-get install python-git
 
+Copy <cm_version>_extra_packages.xml to .repo/local_manifests of each <cm_version> tree
+to make sure you sync all the extra packages not included in the main manifest.
+
 Executing
 ---------
 Export the following environment variables to set the API keys and the base path.
diff --git a/config/extra_packages_cm-12.1.xml b/config/cm-12.1_extra_packages.xml
similarity index 100%
rename from config/extra_packages_cm-12.1.xml
rename to config/cm-12.1_extra_packages.xml
diff --git a/config/extra_packages_cm-13.0.xml b/config/cm-13.0_extra_packages.xml
similarity index 100%
rename from config/extra_packages_cm-13.0.xml
rename to config/cm-13.0_extra_packages.xml
diff --git a/crowdin_sync.py b/crowdin_sync.py
index 0d57253..1896af2 100755
--- a/crowdin_sync.py
+++ b/crowdin_sync.py
@@ -284,7 +284,7 @@
         # project in all_projects and check if it's already in there.
         all_projects.append(result)
 
-        # Search android/default.xml or config/extra_packages_%(branch).xml
+        # Search android/default.xml or config/%(branch)_extra_packages.xml
         # for the project's name
         for project in items:
             path = project.attributes['path'].value
@@ -326,7 +326,7 @@
     if xml_android is None:
         sys.exit(1)
 
-    xml_extra = load_xml(x='%s/config/extra_packages_%s.xml'
+    xml_extra = load_xml(x='%s/config/%s_extra_packages.xml'
                            % (_DIR, default_branch))
     if xml_extra is None:
         sys.exit(1)